Do you use Google Reader for your RSS feeds? If you go look at it right now, you'll see that one of the menu options on the left is "Explore". Under that menu you will see a selection of blog posts that Google thinks might interest you. The list is generated based on the feeds you are already following. It seems to me that "Explore" was adapted for Google Reader Play.
I've looked it over, and most of the suggestions are images. Great. Google Reader was good at finding text, not images. This could be an interesting new toy.